Vamped aren't 'old' rewrapped batteries. They are new rewrapped batteries:
http://www.sz-worldsales.com/goods-...37v Most Powerful mechanical mod battery.html
Product Description
New EFAN 40AMP IMR 18650 2000mAh 3.7v Most Powerful mechanical mod battery :
40 Amp Cell
2000 mAh
Most Powerful mechanical mod battery
Always use caution when using a sub ohm atomizer and a 40 amp battery. Proceed with caution.
Vamped batteries are only to be used in a safe and controlled manner.
ItemSpecifications
4.1Typical Capacity2030mAh @ 0.2C Discharge
Minimum capacity2000mAh @ 0.2C Discharge
4.2Nominal voltage3.7V
4.3Standard ChargeCC/CV,0.2C5A, 4.20V
4.4Standard DischargeCC,0.2C5A, 3.00V
4.5End-of-charge Voltage4.20V±0.05V
4.6End-of-charge Current0.01 C5A (At CV mode)
4.7End-of-discharge Voltage3.00 V
4.8Charging Time8.0hours(standard charge)
4.9Quick Charge Current2000mA (1.0 C5 rate)1C charge
4.10Quick Discharge Current20A (10.0 C5 rate)10C Discharge
4.11Max Discharge Current40A (20.0 C5 rate)20C Discharge
4.12Initial ImpedanceMax:18mΩ
4.13WeightApprox:40.0±2g
4.14Operating temperatureCharging: 0℃~45℃Discharging:-20℃~60℃
4.15Storage temperature-5℃~35℃
4.16Storage Humidity≤75% RH
4.17AppearanceWithout scratch, distortion, contamination and leakage
4.18Standard environmental conditionTemperature) : 25±5℃Humidity
: 45-75%RHAtmospheric Pressure) : 86-106 KPA
4.19Temperature Dependence of Discharge Capacity@ 0.2C Discharge
Charge temperatureDischarge temperature
25℃-10℃0℃15℃25℃40℃
Relative Capacity50%80%90%100%80%
40 Amp 18650 Battery Specification
General Performance of Vamped 40 Amp Battery
ItemTest Methods and ConditionCriteria
5.10.2C CapacityAfter standard charging, rest battery for 10min, then discharging at 0.2C to voltage 3.0V, recording the discharging time.≥300min
5.2Cycle LifeConstant current 0.5C charge to 4.2V, then constant voltage charge to current declines to 0.01C, rest 10min,constant current 0.5C discharge to 3.0V,rest 10min. Repeat above steps till continuously discharging capacity Higher than 80% of the Initial Capacities of the Cells≥300 times
5.3Capability of keeping electricity20±5℃, After standard charging, rest the battery 28days, discharging at 0.2C to voltage 3.0V, recording the discharging